I spoke to the staff from the Houston consulate later today.
First, if the applicant resides in Dallas, he should apply the visa from the Houston consulate.
Second, the application form can be faxed to the applicant.
Normally there are two pages, the first page is the list of all the requirements, and the second page is the application form.
She wasn't sure about the info of multiple entry visa. But all the applicants required an interview prior to the visa is granted.
Well, personally I've never tried to apply an Chilean visa before, so you might need to find out the rest by yourself.
Once again, give them a call and hope you will be able to visit Chile soon.